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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3820c3d838d8d7eb4520def6a16279dc3dba98827decf1ade9169a846e22eeee' 
  AND token = '8WDp40vgS3Ob9tnaga5DmLrAMF/aAJqPqh2N6xbIChc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}